SATA SSD vs. PCIe SSD, worth the difference?

SATA III can give read/write speeds of up to 600MB/s; whereas PCIe, for example the Samsung 970 EVO, has read/write speeds of 3,500/2,500. I'm wondering whether this difference is actually much noticeable in real world use of Kontakt (which I use in Reaper).

I have an Apple iMac Core i7 4.2GHz 27-Inch (5K, Mid-2017)
It has a 1TB fusion drive. That drive uses HHD on SATA III, of about 1TB, and then something like 32GB of SSD on the PCIe - super fast. That's used for the OS I think, and maybe some commonly used apps.

I'm thinking to make the PCIe drive big enough to put all my apps on (only about 40GB at the moment) as well - if so then maybe 250GB. I'm wondering if Reaper, using Kontakt plugins would work noticeably better/faster if I have Reaper and Kontakt on that PCIe drive vs the SATA III SSD. Anyone know?

Also would it make a noticeable difference to have my whole instrument library on the PCIe drive? It would need to be rather big if so! Or, is there no difference in real usage (let's say 20 or so instruments) between that and the usual SATA III SSD (like the 860 EVO (read/write 485/454) or Crucial MX500 (read/write 474/417) for example)?

Otherwise I may as well just upgrade the SATA III to SSD and leave the 32GB of original PCIe type, and put the OS on that. Though I'm planning to upgrade the 8GB of RAM up to 40BG (adding 32GB), and I read one place that the 32GB PCIe might give problems, maybe freezing apps, meaning that with more RAM that drive should also be bigger, which would if true make it worth upgrading that size at least a bit (250GB is pretty cheap anyway) - so if anyone knows about that and can clarify, that would be great!

The maximum speed of a SATA disk is 600 Megabytes per second what is the maximum transmission rate of the SATA III interfaces. On the other hand, the I/O of a PCIe 3.0 device using 4 lanes (common on NVMe devices) is 4 Gigabytes per second.

Practically, the read/ write speed is not only restricted by the used interface but also on the disk itself but if you want something faster than 600 Megabytes a second, this cannot be realized using a SATA device.

The maximum speed of a SATA disk is 600 Megabytes per second what is the maximum transmission rate of the SATA III interfaces. On the other hand, the I/O of a PCIe 3.0 device using 4 lanes (common on NVMe devices) is 4 Gigabytes per second.

Practically, the read/ write speed is not only restricted by the used interface but also on the disk itself but if you want something faster than 600 Megabytes a second, this cannot be realized using a SATA device.

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Yeah but my question is whether this makes a noticeable difference in real usage. Any views on that?

Now, for initial loading of patches, NVMe is going to be faster than SATA SSD.

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So you reckon it's worth it? If it's only about loading a file taking a few more seconds, I'm not too fussed. I'm more worried about being able to make music without anything freezing or glitching or functioning too slow while I'm composing, listening back etc. And also maybe to future-proof it a bit.

Also, for your thing, my instrument library would have to be on that PCIe drive? Or, enough just to have Reaper and the OS and Kontakt on that drive, and the library on the SATA SSD?

Also this difference will be more than the drives I mentioned, since EVO 860 is faster I think than 850, and 960 Pro is faster than regular 960 - I heard that the 960 Pro has issues with iMac so it seems only the regular 960 is recommended for iMac. This is not a criticism at all - very grateful for sharing! But just pointing that out.

If it's only about loading a file taking a few more seconds, I'm not too fussed.

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It's really pretty much just about that. The linked document also states it. Kontakt doesn't utilize large Queue Depth values, which is where SSDs excel at - you only get those very high read speeds with QD32. Kontakt uses QD1 or QD2 at best. There's no huge benefit in using an NVMe for disk streaming vs regular SATA SSD, unless those few seconds shorter loading times are really worth it to you. But the price difference...

Yeah but my question is whether this makes a noticeable difference in real usage. Any views on that?

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I replaced my old SATA SSD with a PCIe-based NVME disk and my DAW projects open much faster now. And also when browsing the Kontakt instruments, it is also possible now to load data-intensive ones without needing to wait half a minute. But the SSD I used before was an old one and not as fast as a SATA 3 disk may be.